/*
 * (C) Copyright 2006-2010 Nuxeo SAS (http://nuxeo.com/) and contributors.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the GNU Lesser General Public License
 * (LGPL) version 2.1 which accompanies this distribution, and is available at
 * http://www.gnu.org/licenses/lgpl.html
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * Contributors:
 *     bstefanescu
 */
package org.nuxeo.gwt.habyt.demo.server;

import java.io.StringWriter;
import java.net.MalformedURLException;
import java.net.URL;

import javax.servlet.ServletContext;

import freemarker.cache.URLTemplateLoader;
import freemarker.template.Configuration;
import freemarker.template.Template;

/**
 * @author <a href="mailto:bs@nuxeo.com">Bogdan Stefanescu</a>
 * 
 */
public class RenderingEngine {

    protected ServletContext ctx;

    protected Configuration cfg;

    public RenderingEngine(ServletContext ctx) {
        this.ctx = ctx;
        this.cfg = new Configuration();
        this.cfg.setWhitespaceStripping(true);
        this.cfg.setLocalizedLookup(false);
        this.cfg.setClassicCompatible(true);
        this.cfg.setTemplateLoader(new MyURLTemplateLoader());
    }

    public String render(Object ctx, String viewId) throws Exception {
        Template temp = cfg.getTemplate(viewId);
        StringWriter writer = new StringWriter();
        temp.process(ctx, writer);
        return writer.toString();
    }

    class MyURLTemplateLoader extends URLTemplateLoader {
        @Override
        protected URL getURL(String name) {
            try {
                return ctx.getResource("/templates/doc/" + name + ".ftl");
            } catch (MalformedURLException e) {
                return null;
            }
        }
    }

}
